Perhaps you should try some spelling variations:
mer mathematical » her mathematical, mpr mathematical, over mathematical
mathematical und » mathematica und, mathematical union, mathematical using
der grenzgebiete » die grenzgebiete, dem grenzgebiet, ihre grenzgebiete
modeling survey » modeling supply, models survey, modeling survival
ergebnisse mer » ergebnisse mean, ergebnisse mit, ergebnisse 3
model surgery » modern surgery, bowel surgery, oral surgery
model survey » models survey, modern survey, moral survey

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ergebnisse mer mathematical und der grenzgebiete. 2. folge, a series of ((((model survey) OR (model surgery))) OR (modeling survey)) in mathematics.
• Adding a wildcard symbol may retrieve word variants: ergebnisse mer mathematical und der grenzgebiete. 2. folge, a series of ((((model survey) or (model surgery))) or (modeling survey)) in mathematics*.